Magnetic transducer head and mount therefor



Feb. 26, 1952 E. BERLANT MAGNETIC TRANSDUCER HEAD AND MOUNT THEREFOR Filed Nov. 19, 1948 IN VEN TOR. EMMANUEL BERLAN T A T TORNE K Patented Feb. 26, 1952 OFFICE partnershi Appraise theater 19; an, said its. 6035i 6 claims. (01. fla r-om) The invention relates to a magnetic transducer head and more particularly to a magnetic head for recording sound on a magnetic tape or for reproducing sound therefrom. V

Heretoiore it has been proposed to construct a magnetic head in two halves each having inclined core legs having plane faces which abut at one end or" the head and which are slightly spaced apart by a separator at the other end of the head to provide a narrow gap where the sound is translated onto or from the tape.

An object of the present invention is to improve and simplify the means for holding the two halves together.

A further object of the invention is to hold the core halves together by tension. This has the advantage of avoiding an increase in the core loss due to excessive pressure as encountered with certain devices such as clamps heretofore used.

A further object of the invention is to provide an adjustable'inount for the head whereby it can be adjusted in both height and orientation so as to properly position the magnetic gap with respect to the tape. 7 I

For further details of the invention reference may be made to the drawings wherein-'- v Fig. 1 is a vertical sectional view of a mag netic transducer head according to the" presentinvention. p 1

Fig. 2 is an enlarged sectional View on" line 2-'2 of Fig. 1 looking in the direction of the arrows, the view being rotated clockwise a quarter turn;

Fig. 3 is a sectional view on line 3-'3- of Fig. 2 looking in the direction of the arrows. I

. Fig. 4 is a perspective view of one of the flat laminations of the core, the dot dash line' representing the line along which the corners are cut topr'ovide the flat faces which fit with corre" sponding flat faces on a similar lamination re versed in position as shown in Fig. 2. g I

Fig. 5 isan enlarged perspective view of the tensioning device for holding the core halves together. H v

Fig. 6 is a perspective view ofone ofthebdw springs supporting the head.

Referring in detail to the drawings, head I as previously described is made in two halves indicated at 2 and 3 in Fig. 2, each half having acoil shown at 4 and 5 respectively. In each 5 pl faces" 8' and 9 at one end of the head fitting t eras shown at it, while the plane faces i ndil at the other end of the head are separatedfhy anon-magnetic separator 13 which may bdflOOS inch thick, to provide a narrow linear pli... v V

Thelaininations' 6 are stacked, end discs 16 and ll' of insulating material are passed over the le e H}, and I respectively and this assembly din varnish and bakedto provide a mag- H core half and form on which the coil 4 is we nd; The other half 3 of the head is made m ssmewa V I Thelamination .6 has an intermediate portion 36 having parallel sideshaving the same length as the length of the coil and adjacent the junc-' ture of the legs I4 and I5 therewith is provided a notch shown' at l8 on one side of the leg I5 and a" notch Is on the corresponding side of i'eg'f n. l-Ie nce each stack of laminations which forms the core portion for the head half}, 3" hasa pair of parallel notches like 18 and i9' which eiitend the full height of the stack.

order to hold the two halves of the head heheafd project, while the corresponding legs [5;and225: at the other end of the head project through a: similar aperture i2l in a plate 26 like ente- Z'U' aS' indicated in Fig. 2.

I which are parallel and spaced apart the same as' the" height of the stack of laminations inord'er' to prevent'one core half from shifting with respect to theo'ther in a plane at right angles to the drawing as seen in Fig. 2'. At the app ite end-of the aperture 2 are provided inl leaf spring portions 29 and 30 which fit hit the recesses 31" and I9 respectively at the apt ide' of the legs. recess" I9 except that it is ol'iverse in position a's shownin Fig.2; The length of the spring 29 is the same as the length of recess SI and the l"" t offspring 30 is the same as the length of 0 LI l w'herebythe' end 32 of spring 29 extendsf behind'the'end wall 33' of the notch 32, toholdtheplate' 28 against the disc it on the endof'tliecoil 5. Theend 3d of spring 3% similarly" liesiinthe notch i9 and extends behind the-"end Wall '35 of that notch, to hold other side ofpl ate'flfagainst the'disc I6 at the end of coil t.

'Spflngs 29and 30" are" compression springs and together with corresponding legs in abutting orresponding legs like l4 and Mat one end erture 2| has upper and lower edges 2'! Recess Si is the same as hence they force one end of the two halves 2 and 3 together with spring tension. Also as the springs 29 and fit in their respective notches 3| and I9, respectively, this holds plate 20 in position and prevents it from being withdrawn lengthwise from the legs M and 24, unless of course one were to pry such springs out of their notches.

The faces 8 and 9 are likewise held together by plate 26 having a spring which fits in notch I8 and a spring 4| which fits in a similar notch 42. The springs 40 and 4| are like the springs 29 and 30 and are arranged on the plate 26.

The plate 20 serves also to support its end of the head, in having an integral flange 43 extending at right angles to the body 44 of the plate. Flange 43 has three bolt holes 45, 4'6, and 41. The companion plate 26 has a similar flange indicated at 48 also having three similar bolt holes. The flanges 43 and 48 lie in the same horizontal plane and serve as brackets to support the head. The flanges 43 and 48 are provided with a full floating compression spring support provided by a bow spring like spring 50 in Fig. 6, for each flange. Spring 58 has a flat intermediate portion 5| having a bolt hole 52. Sprin 50 has elevated ends 53 and 54 each having an enlarged bolt hole indicated at 55 and 56, respectively. The spring ends 53 and 54 support the ends of flange 48 as shown in Fig. 3 while the intermediate portion 5| is supported by a shallow base 59 on which fits a cover 51 which fits over the head. The cover '57 has an opening 58 through which the outer ends of the legs l4 and 24 project so that the tape 60 can ride thereon.

A bolt 6| passes through a hole like 45 in flange 48 and through hole 55 in the end of spring 50 and through a hole 62 in the base 59 and through a panel 63. Bolt 6| has a head 64 at its upper end and its lower end has threads 65 for a nut 65. The bolts 81 and 68 in like manner pass through similar holes in the flange 48, spring 5|, base 59 and panel 63, being provided with nuts 69 and Ill, respectively, at their lower ends. The spring 50 is a compression spring tending to push the head away from the panel 63, such action being restrained by the bolts 6|, 6'! and 58 to a degree depending upon how far their respective nuts are threaded on these bolts. It will be apparent, therefore, that the nuts 65, 69 and 18 can be adjusted by either equal or unequal amounts, to adjust the elevation of gap l3 with respect to panel 63 or to orient gap I3 to bring it to a desired vertical position with respect to panel 63, in order to properly locate the gap l3 with respect to tape 60. Tape 60 is supported by guide rollers or the like mounted on panel 53. Such guide rollers and a suitable drive for the tape is well known and not illustrated.

The other end of the head has three similar adjusting bolts H, 12, and 13 and a section through them corresponding to section 3-3 would look the same as shown in Fig. 3, such bolts acting on a spring 31 like 50 in order to adjust the height and orientation of their end of the head.

It will be apparent therefore that the invention provides a simple device for holding the two halves of the head together and for supporting them, as such device requires simply a pair of plates as shown in Fig. 5 and a pair of springs as shown in Fig. 6 plus bolt-s therefor. The halves 2, 3 are assembled in obverse relation shown in Fig. 2 by slipping the two plates 20, 26 over the core legs at the opposite ends of the head to thereby from the spirit of the following claims.

I claim: 1. A magnetic head having a pair of core halves each having a pair of inclined legs and I apertured flanges through which said legs extend, the corresponding legs at one side of the core halves fitting together and the corresponding legs at the other side of the core halves being spaced forming a gap, a separator in said gap, the outside of each of said legs of both core halves having a notch and a pair of plates each having an aperture through which the corre sponding legs project at opposite sides of the core, respectively, mounted on the adjacent flanges each of said plates havin a pair of spaced compression leaf springs each fitting one of said notches of said corresponding legs, the springs of each plate forcing the corresponding legs together, each notch having a wall serving as an abutment for the end of its spring to hold said plates in position.

2. A magnetic head according to claim 1 wherein each of said core halves has a coil, each of said plates fitting across one of the correspondin ends of both of said coils and being held thereon by its said springs.

3. A magnetic head according to claim 1, each of said plates having an angular flange, said flanges serving as supports for the head.

4. A magnetic head mounted on a base and having a magnetic gap, means for orienting said gap spacially and angularly with reference to the base comprising a full floating compression spring support for said head, said spring support supporting said head at each end thereof and on opposite sides of the center line through said gap and means engaging said base and support for securing said support in selected oriented positions.

5. A magnetic head formed with a gap, supporting means for said head including spaced plate members, a bow leaf spring support for each plate member mounted on a base, the ends of said springs engaging the respective plate members on opposite sides of a plane common to said gap and the mid portions of the springs,

" said spring mid portions being supported on said base, and adjusting bolts selectively connectingthe ends of said springs and plate members to said base to vary the spacing of said gap from said base.

6. A magnetic head according to claim 5 wherein the adjusting bolts may be differentially adjusted to vary the angular position of said gap with respect to said plane.

EMMANUEL BERLANT.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 807,078 Hoelzer Dec. 12, 1905 1,690,154 Alden Nov. 6, 1928 Camras June 13, 1944 

